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Measurement of the Relative Abundances of the Ultra-Heavy Galactic Cosmic Rays (30 ≤ Z ≤ 40) with TIGER

Rauch, B. F. and Israel, M. H. and Barbier, L. M. and Binns, W. R. and Christian, E. R. and Cummings, A. C. and de Nolfo, G. A. and Geier, S. and Link, J. T. and Mewaldt, R. A. and Mitchell, J. W. and Schindler, S. M. and Scott, L. M. and Stone, E. C. and Streitmatter, R. E. and Waddington, C. J. (2007) Measurement of the Relative Abundances of the Ultra-Heavy Galactic Cosmic Rays (30 ≤ Z ≤ 40) with TIGER. In: Proceedings of the 30th International Cosmic Ray Conference. Vol.2. Universidad Nacional Autónoma de México , Merida, Yucatan, Mexico, pp. 7-10.

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Observations of ultra-heavy (Z≥30) galactic cosmic rays (GCR) help to distinguish possible origins of GCR. The Trans-Iron Galactic Element Recorder (TIGER) measures the charge (Z) and energy of GCR using a combination of scintillators, Cherenkov detectors, and a scintillating fiber hodoscope. The two Cherenkov radiators, one acrylic and one aerogel, provide TIGER with an energy sensitivity between 0.3 and 10 GeV/nucleon in the instrument. The threshold at the top of the atmosphere is close to 0.8 GeV/nucleon for Fe. TIGER has accumulated data on two successful flights from McMurdo, Antarctica launched in D ecember 2001 and December 2003 with a total flight duration of 50 days. The combined dataset resolves ~140 nuclei with Z > 30, and provides the best measurements to date for 30Zn, 31Ga, 32Ge, and 34Se. The results for Ga and Ge taken together are inconsistent with a GCR source with Solar-System abundances modified either by preferential acceleration of elements of low first ionization potential or by preferential acceleration of refractory elements, suggesting that elemental composition of the GCR source is different from that of the Solar System

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Israel, M. H.0000-0002-8104-208X
Binns, W. R.0000-0001-6110-3407
Christian, E. R.0000-0003-2134-3937
Cummings, A. C.0000-0002-3840-7696
de Nolfo, G. A.0000-0002-3677-074X
Geier, S.0000-0002-3948-9339
Mewaldt, R. A.0000-0003-2178-9111
Stone, E. C.0000-0002-2010-5462
Additional Information:Copyright Universidad Nacional Autónoma de México This research was supported in part by a NASA grant, NNG05WC04G, and in part by Washington University. The success of these two balloon flights depended on the excellent support of the Columbia Scientific Balloon Facility, the NSF Office of Polar Programs, and the NASA Balloon Program Office
Group:Space Radiation Laboratory
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Space Radiation Laboratory2008-24
Record Number:CaltechAUTHORS:20150414-113415014
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:56634
Deposited By: Deborah Miles
Deposited On:21 Apr 2015 20:37
Last Modified:09 Mar 2020 13:19

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